Another factor is the availability of remnant minutes when one uses the monthly contract. Also if when calling abroad, costs may differ.

The cost for calling 0300 numbers is regulated the same principle that regulates numbers that start with 01 or 02. Meaning, the charges are the same. For local landline numbers, companies have to include calls to 0300 numbers in them. However, if calling on mobile and outside these deals, the call ranges from 3 pence per minute to 40 pence per minute.